Because at that time, the 2019 novel coronavirus was a completely new pathogen to humans, and people’s knowledge about it was still very limited. Its sudden speed caught people off guard.

It has been two years since the novel coronavirus developed to this day, but whenever we recall it, people still cannot calm down for a long time.

Because at that time, 019 new coronavirus was a brand new pathogen to humans. People’s knowledge of it was still very limited, and its sudden speed caught people off guard.

coronavirus is a single-stranded positive-strand RNA virus. There are six known coronaviruses that infect humans, and the new coronavirus is the seventh.

What are the characteristics of the "new coronavirus"?

. Etiological characteristics: The genetic characteristics are obviously different from SARSr-GoV and MERSr-CoV, and the virus is more sensitive to ultraviolet rays and heat;

. Epidemiological characteristics: The source of infection is a person infected with the new coronavirus. Respiratory droplets spread through contact with , so the population is generally susceptible;

3. Clinical characteristics: the incubation period is 1-14 days, most patients have a good prognosis , and the symptoms in children are relatively mild.

In addition, the symptoms of patients infected with the new coronavirus are not specific, so a comprehensive diagnosis requires a combination of epidemiological history, laboratory tests, imaging tests, etc.

How can we tell whether it is a "new coronavirus"?

First of all, there must be clinical manifestations of new coronavirus pneumonia , such as fever, cough, and fatigue. Secondly, the hospital must do blood routine and lung CT to determine whether it is a suspected case.

The conditions for suspected cases include epidemiological history and clinical manifestations .

There are four conditions for epidemiological history:

1. Travel history or residence history to Wuhan City and surrounding areas, and other case-reported communities within 14 days before the onset of fever;

2. Contact with persons infected with the new coronavirus within 14 days before the onset of fever, Those who test positive for nucleic acid have a history of contact;

3. Have been in contact with patients with fever or respiratory symptoms from Wuhan and surrounding areas, or from communities with reported cases within 14 days before the onset of illness;

4. Cluster onset.

There are three conditions for clinical manifestations:

1. Fever and or respiratory symptoms;

2. There are imaging features of new coronavirus pneumonia;

3. The total number of white blood cells in the early stage of the disease is normal or reduced, and the lymphocyte count is reduced.

Conditions for diagnosing suspected cases: 1. Have any one of the epidemiological history, and meet any two of the clinical manifestations; 2. No clear epidemiological history, meet three of the clinical manifestations, diagnose the suspected case before conducting Nucleic acid test or gene sequencing confirmed the diagnosis.

The dawn of dawn - The new crown vaccine has been developed!

The new coronavirus vaccine is a biological agent used to prevent new coronavirus infection or new coronavirus pneumonia. Currently, vaccines around the world can be roughly divided into six categories, namely attenuated vaccines, inactivated vaccines , protein subunit vaccines, and viral vector vaccines. , nucleic acid vaccine and virus-like particle vaccine.

The COVID-19 vaccine currently commonly vaccinated in our country is an inactivated vaccine. After being inoculated into the human body, it can stimulate the body's immune system to produce protective antibodies. This antibody exists in human body fluids. Once the COVID-19 virus appears in the human body, the antibodies will immediately act and Neutralize and activate complement to kill the virus and prevent it from infecting the human body.

What is the significance of subsequent injections?

When the new coronavirus vaccine injection was first developed, there were only two injections. At this time, the vaccine was mainly used to suppress strains without mutations.

However, with the passage of time and the mutant strains represented by Delta, the initially developed vaccine has no obvious inhibitory effect on the strain at this time, so the third and fourth doses of the virus vaccine will be administered in order to enhance the effectiveness of the vaccine. The immunity in the human body ensures that everyone will not be tortured by viruses again!

As follow-up injections are carried out and people are vaccinated one after another, on the one hand, it is to protect people's lives, and on the other hand, it is also to prove to the world China's determination and perseverance in fighting the virus, and to show other countries that China will not take the same measures as Western countries. The policy of coexisting with the virus throws away people’s lives.

China always puts the health and safety of its citizens first. People will not be charged any fees for vaccination. This is also a proof of China’s comprehensive national strength!

The fourth shot is about to start? Those who plan to vaccinate, please note that the state recommends that these five categories of people do not vaccinate.

By the beginning of this year, there will be a small-scale epidemic rebound in various parts of China. Is it necessary to receive the fourth dose of the vaccine at this time? To enhance the immunity of the population in this way?

I have heard the news before that an expert group from the Israeli Ministry of Health recommended vaccination with the fourth shot. The Prime Minister also welcomed this decision and considered it good news, which will help us overcome the mysterious Kron that is spreading across the country. The decision will require formal approval from senior health officials.

However, general vaccination also has certain limitations. The basic purpose is to ensure the health of the people. However, not all groups can be vaccinated. The National Health Commission of my country has also issued relevant warnings. The following five categories of people should be cautious about vaccination:

- Vaccine People with a history of allergies

For people with allergies, the fourth shot of the extra-sexual vaccine is not recommended. Even the safest drugs should be chosen carefully, and you should know whether you have a history of allergies before vaccination.

——Have suffered from respiratory disease

As a new type of respiratory disease, it is very harmful to the lungs. After injection, the inactivated vaccine will enter the human body and produce antibodies, so people with these diseases should be vaccinated with caution.

- Angioedema

Angioedema is also known as giant urticaria, urticaria is an allergic reaction, and groups with such conditions are not suitable for vaccination with booster shots.

- People suffering from uncontrolled epilepsy and other severe neurological diseases

such as transverse myelitis , Guillain-Barre syndrome , demyelinating diseases, etc. These groups of people are not suitable for vaccination with the new coronavirus. vaccine.

- Pregnant women

If you become pregnant after vaccination or received the vaccine without knowing the pregnancy, based on the understanding of the safety of the vaccine, it is not recommended to take special medical measures (such as termination) just because of vaccination new coronavirus vaccine Pregnancy ), it is recommended to do pregnancy check-ups and follow-up.